<?php

// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id$

class Page extends Think {

    // 起始行数
    public $firstRow;
    // 列表每页显示行数
    public $listRows;
    // 页数跳转时要带的参数
    public $parameter;
    // 分页总页面数
    protected $totalPages;
    // 总行数
    protected $totalRows;
    // 当前页数
    protected $nowPage;
    // 分页的栏的总页数
    protected $coolPages;
    // 分页栏每页显示的页数
    protected $rollPage;
    // 分页显示定制
    protected $config = array('header' => '条记录', 'prev' => '上一页', 'next' => '下一页', 'first' => '第一页', 'last' => '最后一页', 'theme' => ' %totalRow% %header% %nowPage%/%totalPage% 页 %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%');

    /**
      +----------------------------------------------------------
     * 架构函数
      +----------------------------------------------------------
     * @access public
      +----------------------------------------------------------
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
      +----------------------------------------------------------
     */
    public function __construct($totalRows, $listRows, $parameter='') {
	$this->totalRows = $totalRows;
	$this->parameter = $parameter;
	$this->rollPage = C('PAGE_ROLLPAGE');
	$this->listRows = !empty($listRows) ? $listRows : C('PAGE_LISTROWS');
	$this->totalPages = ceil($this->totalRows / $this->listRows);     //总页数
	$this->coolPages = ceil($this->totalPages / $this->rollPage);
	$this->nowPage = !empty($_GET[C('VAR_PAGE')]) ? $_GET[C('VAR_PAGE')] : 1;
	if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
	    $this->nowPage = $this->totalPages;
	}
	$this->firstRow = $this->listRows * ($this->nowPage - 1);
    }

    public function setConfig($name, $value) {
	if (isset($this->config[$name])) {
	    $this->config[$name] = $value;
	}
    }

    /**
      +----------------------------------------------------------
     * 分页显示输出
      +----------------------------------------------------------
     * @access public
      +----------------------------------------------------------
     */
    public function show() {
	if (0 == $this->totalRows)
	    return '';
	$p = C('VAR_PAGE');
	$nowCoolPage = ceil($this->nowPage / $this->rollPage);
	$url = $_SERVER['REQUEST_URI'] . (strpos($_SERVER['REQUEST_URI'], '?') ? '' : "?") . $this->parameter;
	$parse = parse_url($url);
	if (isset($parse['query'])) {
	    parse_str($parse['query'], $params);
	    unset($params[$p]);
	    $url = $parse['path'] . '?' . http_build_query($params);
	}
	//上下翻页字符串
	$upRow = $this->nowPage - 1;
	$downRow = $this->nowPage + 1;
	if ($upRow > 0) {
	    $upPage = "<a href='" . $url . "&" . $p . "=$upRow'>" . $this->config['prev'] . "</a>";
	} else {
	    $upPage = "";
	}

	if ($downRow <= $this->totalPages) {
	    $downPage = "<a href='" . $url . "&" . $p . "=$downRow'>" . $this->config['next'] . "</a>";
	} else {
	    $downPage = "";
	}
	// << < > >>
	if ($nowCoolPage == 1) {
	    $theFirst = "";
	    $prePage = "";
	} else {
	    $preRow = $this->nowPage - $this->rollPage;
	    $prePage = "<a href='" . $url . "&" . $p . "=$preRow' >上" . $this->rollPage . "页</a>";
	    $theFirst = "<a href='" . $url . "&" . $p . "=1' >" . $this->config['first'] . "</a>";
	}
	if ($nowCoolPage == $this->coolPages) {
	    $nextPage = "";
	    $theEnd = "";
	} else {
	    $nextRow = $this->nowPage + $this->rollPage;
	    $theEndRow = $this->totalPages;
	    $nextPage = "<a href='" . $url . "&" . $p . "=$nextRow' >下" . $this->rollPage . "页</a>";
	    $theEnd = "<a href='" . $url . "&" . $p . "=$theEndRow' >" . $this->config['last'] . "</a>";
	}
	// 1 2 3 4 5
	$linkPage = "";
	for ($i = 1; $i <= $this->rollPage; $i++) {
	    $page = ($nowCoolPage - 1) * $this->rollPage + $i;
	    if ($page != $this->nowPage) {
		if ($page <= $this->totalPages) {
		    $linkPage .= "&nbsp;<a href='" . $url . "&" . $p . "=$page'>&nbsp;" . $page . "&nbsp;</a>";
		} else {
		    break;
		}
	    } else {
		if ($this->totalPages != 1) {
		    $linkPage .= "&nbsp;<span class='current'>" . $page . "</span>";
		}
	    }
	}
	$pageStr = str_replace(
		array('%header%', '%nowPage%', '%totalRow%', '%totalPage%', '%upPage%', '%downPage%', '%first%', '%prePage%', '%linkPage%', '%nextPage%', '%end%'), array($this->config['header'], $this->nowPage, $this->totalRows, $this->totalPages, $upPage, $downPage, $theFirst, $prePage, $linkPage, $nextPage, $theEnd), $this->config['theme']);
	return $pageStr;
    }

}

?>